User manual
Table Of Contents
- Zynq-7000 All Programmable SoC
- Table of Contents
- Ch. 1: Introduction
- Ch. 2: Signals, Interfaces, and Pins
- Ch. 3: Application Processing Unit
- Ch. 4: System Addresses
- Ch. 5: Interconnect
- Ch. 6: Boot and Configuration
- Ch. 7: Interrupts
- Ch. 8: Timers
- Ch. 9: DMA Controller
- Introduction
- Functional Description
- DMA Transfers on the AXI Interconnect
- AXI Transaction Considerations
- DMA Manager
- Multi-channel Data FIFO (MFIFO)
- Memory-to-Memory Transfers
- PL Peripheral AXI Transactions
- PL Peripheral Request Interface
- PL Peripheral - Length Managed by PL Peripheral
- PL Peripheral - Length Managed by DMAC
- Events and Interrupts
- Aborts
- Security
- IP Configuration Options
- Programming Guide for DMA Controller
- Programming Guide for DMA Engine
- Programming Restrictions
- System Functions
- I/O Interface
- Ch. 10: DDR Memory Controller
- Introduction
- AXI Memory Port Interface (DDRI)
- DDR Core and Transaction Scheduler (DDRC)
- DDRC Arbitration
- Controller PHY (DDRP)
- Initialization and Calibration
- DDR Clock Initialization
- DDR IOB Impedance Calibration
- DDR IOB Configuration
- DDR Controller Register Programming
- DRAM Reset and Initialization
- DRAM Input Impedance (ODT) Calibration
- DRAM Output Impedance (RON) Calibration
- DRAM Training
- Write Data Eye Adjustment
- Alternatives to Automatic DRAM Training
- DRAM Write Latency Restriction
- Register Overview
- Error Correction Code (ECC)
- Programming Model
- Ch. 11: Static Memory Controller
- Ch. 12: Quad-SPI Flash Controller
- Ch. 13: SD/SDIO Controller
- Ch. 14: General Purpose I/O (GPIO)
- Ch. 15: USB Host, Device, and OTG Controller
- Introduction
- Functional Description
- Programming Overview and Reference
- Device Mode Control
- Device Endpoint Data Structures
- Device Endpoint Packet Operational Model
- Device Endpoint Descriptor Reference
- Programming Guide for Device Controller
- Programming Guide for Device Endpoint Data Structures
- Host Mode Data Structures
- EHCI Implementation
- Host Data Structures Reference
- Programming Guide for Host Controller
- OTG Description and Reference
- System Functions
- I/O Interfaces
- Ch. 16: Gigabit Ethernet Controller
- Ch. 17: SPI Controller
- Ch. 18: CAN Controller
- Ch. 19: UART Controller
- Ch. 20: I2C Controller
- Ch. 21: Programmable Logic Description
- Ch. 22: Programmable Logic Design Guide
- Ch. 23: Programmable Logic Test and Debug
- Ch. 24: Power Management
- Ch. 25: Clocks
- Ch. 26: Reset System
- Ch. 27: JTAG and DAP Subsystem
- Ch. 28: System Test and Debug
- Ch. 29: On-Chip Memory (OCM)
- Ch. 30: XADC Interface
- Ch. 31: PCI Express
- Ch. 32: Device Secure Boot
- Appx. A: Additional Resources
- Appx. B: Register Details
- Overview
- Acronyms
- Module Summary
- AXI_HP Interface (AFI) (axi_hp)
- CAN Controller (can)
- DDR Memory Controller (ddrc)
- CoreSight Cross Trigger Interface (cti)
- Performance Monitor Unit (cortexa9_pmu)
- CoreSight Program Trace Macrocell (ptm)
- Debug Access Port (dap)
- CoreSight Embedded Trace Buffer (etb)
- PL Fabric Trace Monitor (ftm)
- CoreSight Trace Funnel (funnel)
- CoreSight Intstrumentation Trace Macrocell (itm)
- CoreSight Trace Packet Output (tpiu)
- Device Configuration Interface (devcfg)
- DMA Controller (dmac)
- Gigabit Ethernet Controller (GEM)
- General Purpose I/O (gpio)
- Interconnect QoS (qos301)
- NIC301 Address Region Control (nic301_addr_region_ctrl_registers)
- I2C Controller (IIC)
- L2 Cache (L2Cpl310)
- Application Processing Unit (mpcore)
- On-Chip Memory (ocm)
- Quad-SPI Flash Controller (qspi)
- SD Controller (sdio)
- System Level Control Registers (slcr)
- Static Memory Controller (pl353)
- SPI Controller (SPI)
- System Watchdog Timer (swdt)
- Triple Timer Counter (ttc)
- UART Controller (UART)
- USB Controller (usb)
Zynq-7000 AP SoC Technical Reference Manual www.xilinx.com 387
UG585 (v1.11) September 27, 2016
Chapter 14: General Purpose I/O (GPIO)
Example: Configure MIO pin 10 as an input
1.
Set the direction as input: Write 0x0 to the gpio.DIRM_0 register. T
his sets gpio.DIRM_0[10]
= 0.
14.3.3
Writing Data to
GPIO
Output Pins
For GPIO pins configured as outputs, there are two options to program the desired value.
Option 1: Read, modify, and update the GPIO pin using the gpio.DATA_0 register.
Example: Set GPIO output pin 10 using the DATA_0 register.
1. Read the gpio.DATA_0 register: Read gpio.DATA_0 register to the reg_val variable.
2. Modify the value: Set reg_val [10] =1.
3. Write updated value to output pin: Write reg_val to the gpio.DATA_0 register.
Option 2: Use the MASK_DATA_x_MSW/LSW registers to update one or more GPIO pins.
Example: Set output pins 20, 25, and 30 to 1 using the MASK_DATA_0_MSW register.
1. Generate the mask value for pins 20, 25, and 30: To drive pins 20, 25 and 30, 0xBDEF is the
mask value for gpio.MASK_DATA_0_MSW [MASK_0_MSW].
2. Generate the data value for pins 20, 25, 30: To drive 1 on pins 20, 25, and 30, 0x4210 is the
data value for gpio.MASK_DATA_0_MSW [DATA_0_MSW].
3. Write the mask and data to the MASK_DATA_x_MSW register: Write 0xBDEF_4210 to the
gpio.MASK_DATA_0_MSW register.
14.3.4
Reading Data from GPIO Input Pins
For GPIO pins configured as inputs, there are two options to monitor the input.
Option 1: Use the gpio.DATA_RO_x register of each bank.
Example: Read the state of all GPIO input pins in bank 0 using the DATA_RO_0 register.
1. Read Input Bank 0: Read the gpio.DATA_0 register.
Option 2: Use interrupt logic on input pins (refer to section 14.2.4 Interrupt Function).
Example: Configure MIO pin 12 to be triggered as rising edge.
1. Set the trigger as a rising edge: Write 1 to gpio.INT_TYPE_0 [12]. Write 1 to
gpio.INT_POLARITY_0 [12]. Write 0 to gpio.INT_ANY_0 [12].
2.
Enable interrupt: Write 1 to gpio.INT_EN_0 [12].
3.
Status of Input pin: gpio.INT_STAT_0 [12] =1 implies that an interrupt event occurred.
4.
Disable interrupt: Write 1 to gpio.INT_DIS_0 [12].